Something is not right here. Where did the young wife of Samuel get an
estate that needed administrating if both her husband and father were
still alive? It's possible (like maybe from her maternal grandparents),
but I think it more probable that you're looking at a different Sarah.

What do the census records show? With the birth and death dates you
indicate, Samuel should appear on the 1910, 1900, 1880, 1870, 1860,
and 1850 censuses. If Jenny is still alive in 1900, the census should
show how many children she has borne. It will also give the month and
year that she and Samuel were born. If Sarah didn't die until 1880,
then there's a 50 percent chance she'll show up on the 1880 census
(taken June 1st)